<div class="slider" #sliderRef [class.slider-vertical]="vertical">
  <app-slider-track [vertical]="vertical" [length]="bufferOffset" [buffer]="true"></app-slider-track>
  <app-slider-track [vertical]="vertical" [length]="offset"></app-slider-track>
  <app-slider-handle [vertical]="vertical" [offset]="offset"></app-slider-handle>
</div>
